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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328504f7d0bd1065d998d21f768fbda9bfee8d742b7cb44143883509bf95e459' 
  AND token = 'WZTGo6R1U9A9NCuVHfFYbmjUA5DoSzcSt9/aunnmo+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}